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Refactor for Clean Code

Refactor messy code into readable, maintainable code while keeping behaviour identical — with every change explained.

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Refactor the code below to make it easier to read and maintain. Behaviour must stay exactly the same.

Goals:
- Smaller functions with one clear job
- Clear names for variables and functions
- Remove duplication
- Reduce nesting (early returns where it helps)

Show the refactored code, then a short list of each change and why it's better. Flag anything you were unsure about rather than guessing.

Language: [LANGUAGE]
Code:
[PASTE CODE]

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